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Explain with the help of labelled ray-diagram, the defect of vision called hypermetropia, and how it is corrected by a lens.

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Hypermetropia (or long-sightedness) is that defect of vision due to which a person cannot see the nearby objects clearly (though he can see the distant object clearly). This eye defect can be corrected by using a convex lens. Hypermetropic eye and its correction is given in the following diagrams:

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